001/*
002 * Copyright (C) 2013 The Guava Authors
003 *
004 * Licensed under the Apache License, Version 2.0 (the "License");
005 * you may not use this file except in compliance with the License.
006 * You may obtain a copy of the License at
007 *
008 * http://www.apache.org/licenses/LICENSE-2.0
009 *
010 * Unless required by applicable law or agreed to in writing, software
011 * distributed under the License is distributed on an "AS IS" BASIS,
012 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
013 * See the License for the specific language governing permissions and
014 * limitations under the License.
015 */
016
017package com.google.common.collect.testing.google;
018
019import static com.google.common.collect.testing.Helpers.assertEmpty;
020import static com.google.common.collect.testing.features.CollectionFeature.SUPPORTS_ADD;
021import static com.google.common.collect.testing.features.CollectionFeature.SUPPORTS_REMOVE;
022import static com.google.common.collect.testing.features.CollectionSize.SEVERAL;
023import static com.google.common.collect.testing.features.CollectionSize.ZERO;
024
025import com.google.common.annotations.GwtCompatible;
026import com.google.common.annotations.GwtIncompatible;
027import com.google.common.collect.testing.Helpers;
028import com.google.common.collect.testing.features.CollectionFeature;
029import com.google.common.collect.testing.features.CollectionSize;
030import java.lang.reflect.Method;
031import java.util.Arrays;
032import java.util.Collections;
033import java.util.List;
034import java.util.Set;
035import org.junit.Ignore;
036
037/**
038 * Tests for {@code Multiset.elementSet()} not covered by the derived {@code SetTestSuiteBuilder}.
039 *
040 * @author Louis Wasserman
041 */
042@GwtCompatible
043@Ignore // Affects only Android test runner, which respects JUnit 4 annotations on JUnit 3 tests.
044public class MultisetElementSetTester<E> extends AbstractMultisetTester<E> {
045  @CollectionFeature.Require(SUPPORTS_ADD)
046  public void testElementSetReflectsAddAbsent() {
047    Set<E> elementSet = getMultiset().elementSet();
048    assertFalse(elementSet.contains(e3()));
049    getMultiset().add(e3(), 4);
050    assertTrue(elementSet.contains(e3()));
051  }
052
053  @CollectionSize.Require(absent = ZERO)
054  @CollectionFeature.Require(SUPPORTS_REMOVE)
055  public void testElementSetReflectsRemove() {
056    Set<E> elementSet = getMultiset().elementSet();
057    assertTrue(elementSet.contains(e0()));
058    getMultiset().removeAll(Collections.singleton(e0()));
059    assertFalse(elementSet.contains(e0()));
060  }
061
062  @CollectionSize.Require(absent = ZERO)
063  @CollectionFeature.Require(SUPPORTS_REMOVE)
064  public void testElementSetRemovePropagatesToMultiset() {
065    Set<E> elementSet = getMultiset().elementSet();
066    int size = getNumElements();
067    int expectedSize = size - getMultiset().count(e0());
068    assertTrue(elementSet.remove(e0()));
069    assertFalse(getMultiset().contains(e0()));
070    assertEquals(expectedSize, getMultiset().size());
071  }
072
073  @CollectionSize.Require(SEVERAL)
074  @CollectionFeature.Require(SUPPORTS_REMOVE)
075  public void testElementSetRemoveDuplicatePropagatesToMultiset() {
076    initThreeCopies();
077    int size = getNumElements();
078    int expectedSize = size - getMultiset().count(e0());
079    Set<E> elementSet = getMultiset().elementSet();
080    assertTrue(elementSet.remove(e0()));
081    assertEmpty(getMultiset());
082    assertEquals(expectedSize, getMultiset().size());
083  }
084
085  @CollectionFeature.Require(SUPPORTS_REMOVE)
086  public void testElementSetRemoveAbsent() {
087    Set<E> elementSet = getMultiset().elementSet();
088    assertFalse(elementSet.remove(e3()));
089    expectUnchanged();
090  }
091
092  @CollectionFeature.Require(SUPPORTS_REMOVE)
093  public void testElementSetClear() {
094    getMultiset().elementSet().clear();
095    assertEmpty(getMultiset());
096  }
097
098  /**
099   * Returns {@link Method} instances for the read tests that assume multisets support duplicates so
100   * that the test of {@code Multisets.forSet()} can suppress them.
101   */
102  @GwtIncompatible // reflection
103  public static List<Method> getElementSetDuplicateInitializingMethods() {
104    return Arrays.asList(
105        Helpers.getMethod(
106            MultisetElementSetTester.class, "testElementSetRemoveDuplicatePropagatesToMultiset"));
107  }
108}